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1 | /* |
2 | * nilfs2_fs.h - NILFS2 on-disk structures and common declarations. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Koji Sato <koji@osrg.net> | |
21 | * Ryusuke Konishi <ryusuke@osrg.net> | |
22 | */ | |
23 | /* | |
24 | * linux/include/linux/ext2_fs.h | |
25 | * | |
26 | * Copyright (C) 1992, 1993, 1994, 1995 | |
27 | * Remy Card (card@masi.ibp.fr) | |
28 | * Laboratoire MASI - Institut Blaise Pascal | |
29 | * Universite Pierre et Marie Curie (Paris VI) | |
30 | * | |
31 | * from | |
32 | * | |
33 | * linux/include/linux/minix_fs.h | |
34 | * | |
35 | * Copyright (C) 1991, 1992 Linus Torvalds | |
36 | */ | |
37 | ||
38 | #ifndef _LINUX_NILFS_FS_H | |
39 | #define _LINUX_NILFS_FS_H | |
40 | ||
41 | #include <linux/types.h> | |
42 | #include <linux/ioctl.h> | |
43 | ||
44 | /* | |
45 | * Inode flags stored in nilfs_inode and on-memory nilfs inode | |
46 | * | |
47 | * We define these flags based on ext2-fs because of the | |
48 | * compatibility reason; to avoid problems in chattr(1) | |
49 | */ | |
50 | #define NILFS_SECRM_FL 0x00000001 /* Secure deletion */ | |
51 | #define NILFS_UNRM_FL 0x00000002 /* Undelete */ | |
52 | #define NILFS_SYNC_FL 0x00000008 /* Synchronous updates */ | |
53 | #define NILFS_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
54 | #define NILFS_APPEND_FL 0x00000020 /* writes to file may only append */ | |
55 | #define NILFS_NODUMP_FL 0x00000040 /* do not dump file */ | |
56 | #define NILFS_NOATIME_FL 0x00000080 /* do not update atime */ | |
57 | /* Reserved for compression usage... */ | |
58 | #define NILFS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
59 | #define NILFS_DIRSYNC_FL 0x00010000 /* dirsync behaviour */ | |
60 | ||
61 | #define NILFS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ | |
62 | #define NILFS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ | |
63 | ||
64 | ||
65 | #define NILFS_INODE_BMAP_SIZE 7 | |
66 | /** | |
67 | * struct nilfs_inode - structure of an inode on disk | |
68 | * @i_blocks: blocks count | |
69 | * @i_size: size in bytes | |
70 | * @i_ctime: creation time | |
71 | * @i_mtime: modification time | |
72 | * @i_dtime: deletion time | |
73 | * @i_uid: user id | |
74 | * @i_gid: group id | |
75 | * @i_mode: file mode | |
76 | * @i_links_count: links count | |
77 | * @i_flags: file flags | |
78 | * @i_bmap: block mapping | |
79 | * @i_xattr: extended attributes | |
80 | * @i_generation: file generation (for NFS) | |
81 | * @i_pad: padding | |
82 | */ | |
83 | struct nilfs_inode { | |
84 | __le64 i_blocks; | |
85 | __le64 i_size; | |
86 | __le64 i_ctime; | |
87 | __le64 i_mtime; | |
88 | __le64 i_dtime; | |
89 | __le32 i_uid; | |
90 | __le32 i_gid; | |
91 | __le16 i_mode; | |
92 | __le16 i_links_count; | |
93 | __le32 i_flags; | |
94 | __le64 i_bmap[NILFS_INODE_BMAP_SIZE]; | |
95 | #define i_device_code i_bmap[0] | |
96 | __le64 i_xattr; | |
97 | __le32 i_generation; | |
98 | __le32 i_pad; | |
99 | }; | |
100 | ||
101 | /** | |
102 | * struct nilfs_super_root - structure of super root | |
103 | * @sr_sum: check sum | |
104 | * @sr_bytes: byte count of the structure | |
105 | * @sr_flags: flags (reserved) | |
106 | * @sr_nongc_ctime: write time of the last segment not for cleaner operation | |
107 | * @sr_dat: DAT file inode | |
108 | * @sr_cpfile: checkpoint file inode | |
109 | * @sr_sufile: segment usage file inode | |
110 | */ | |
111 | struct nilfs_super_root { | |
112 | __le32 sr_sum; | |
113 | __le16 sr_bytes; | |
114 | __le16 sr_flags; | |
115 | __le64 sr_nongc_ctime; | |
116 | struct nilfs_inode sr_dat; | |
117 | struct nilfs_inode sr_cpfile; | |
118 | struct nilfs_inode sr_sufile; | |
119 | }; | |
120 | ||
121 | #define NILFS_SR_MDT_OFFSET(inode_size, i) \ | |
122 | ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \ | |
123 | (inode_size) * (i)) | |
124 | #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0) | |
125 | #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1) | |
126 | #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2) | |
127 | #define NILFS_SR_BYTES (sizeof(struct nilfs_super_root)) | |
128 | ||
129 | /* | |
130 | * Maximal mount counts | |
131 | */ | |
132 | #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */ | |
133 | ||
134 | /* | |
135 | * File system states (sbp->s_state, nilfs->ns_mount_state) | |
136 | */ | |
137 | #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */ | |
138 | #define NILFS_ERROR_FS 0x0002 /* Errors detected */ | |
139 | #define NILFS_RESIZE_FS 0x0004 /* Resize required */ | |
140 | ||
141 | /* | |
142 | * Mount flags (sbi->s_mount_opt) | |
143 | */ | |
144 | #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */ | |
145 | #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ | |
146 | #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ | |
147 | #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ | |
148 | #define NILFS_MOUNT_SNAPSHOT 0x0080 /* Snapshot flag */ | |
149 | #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */ | |
150 | #define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order | |
151 | semantics also for data */ | |
152 | ||
153 | ||
154 | /** | |
155 | * struct nilfs_super_block - structure of super block on disk | |
156 | */ | |
157 | struct nilfs_super_block { | |
158 | __le32 s_rev_level; /* Revision level */ | |
159 | __le16 s_minor_rev_level; /* minor revision level */ | |
160 | __le16 s_magic; /* Magic signature */ | |
161 | ||
162 | __le16 s_bytes; /* Bytes count of CRC calculation | |
163 | for this structure. s_reserved | |
164 | is excluded. */ | |
165 | __le16 s_flags; /* flags */ | |
166 | __le32 s_crc_seed; /* Seed value of CRC calculation */ | |
167 | __le32 s_sum; /* Check sum of super block */ | |
168 | ||
169 | __le32 s_log_block_size; /* Block size represented as follows | |
170 | blocksize = | |
171 | 1 << (s_log_block_size + 10) */ | |
172 | __le64 s_nsegments; /* Number of segments in filesystem */ | |
173 | __le64 s_dev_size; /* block device size in bytes */ | |
174 | __le64 s_first_data_block; /* 1st seg disk block number */ | |
175 | __le32 s_blocks_per_segment; /* number of blocks per full segment */ | |
176 | __le32 s_r_segments_percentage; /* Reserved segments percentage */ | |
177 | ||
178 | __le64 s_last_cno; /* Last checkpoint number */ | |
179 | __le64 s_last_pseg; /* disk block addr pseg written last */ | |
180 | __le64 s_last_seq; /* seq. number of seg written last */ | |
181 | __le64 s_free_blocks_count; /* Free blocks count */ | |
182 | ||
183 | __le64 s_ctime; /* Creation time (execution time of | |
184 | newfs) */ | |
185 | __le64 s_mtime; /* Mount time */ | |
186 | __le64 s_wtime; /* Write time */ | |
187 | __le16 s_mnt_count; /* Mount count */ | |
188 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
189 | __le16 s_state; /* File system state */ | |
190 | __le16 s_errors; /* Behaviour when detecting errors */ | |
191 | __le64 s_lastcheck; /* time of last check */ | |
192 | ||
193 | __le32 s_checkinterval; /* max. time between checks */ | |
194 | __le32 s_creator_os; /* OS */ | |
195 | __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
196 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
197 | __le32 s_first_ino; /* First non-reserved inode */ | |
198 | ||
199 | __le16 s_inode_size; /* Size of an inode */ | |
200 | __le16 s_dat_entry_size; /* Size of a dat entry */ | |
201 | __le16 s_checkpoint_size; /* Size of a checkpoint */ | |
202 | __le16 s_segment_usage_size; /* Size of a segment usage */ | |
203 | ||
204 | __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
205 | char s_volume_name[16]; /* volume name */ | |
206 | char s_last_mounted[64]; /* directory where last mounted */ | |
207 | ||
208 | __le32 s_c_interval; /* Commit interval of segment */ | |
209 | __le32 s_c_block_max; /* Threshold of data amount for | |
210 | the segment construction */ | |
211 | __u32 s_reserved[192]; /* padding to the end of the block */ | |
212 | }; | |
213 | ||
214 | /* | |
215 | * Codes for operating systems | |
216 | */ | |
217 | #define NILFS_OS_LINUX 0 | |
218 | /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */ | |
219 | ||
220 | /* | |
221 | * Revision levels | |
222 | */ | |
223 | #define NILFS_CURRENT_REV 2 /* current major revision */ | |
224 | #define NILFS_MINOR_REV 0 /* minor revision */ | |
225 | ||
226 | /* | |
227 | * Bytes count of super_block for CRC-calculation | |
228 | */ | |
229 | #define NILFS_SB_BYTES \ | |
230 | ((long)&((struct nilfs_super_block *)0)->s_reserved) | |
231 | ||
232 | /* | |
233 | * Special inode number | |
234 | */ | |
235 | #define NILFS_ROOT_INO 2 /* Root file inode */ | |
236 | #define NILFS_DAT_INO 3 /* DAT file */ | |
237 | #define NILFS_CPFILE_INO 4 /* checkpoint file */ | |
238 | #define NILFS_SUFILE_INO 5 /* segment usage file */ | |
239 | #define NILFS_IFILE_INO 6 /* ifile */ | |
240 | #define NILFS_ATIME_INO 7 /* Atime file (reserved) */ | |
241 | #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */ | |
242 | #define NILFS_SKETCH_INO 10 /* Sketch file */ | |
243 | #define NILFS_USER_INO 11 /* Fisrt user's file inode number */ | |
244 | ||
245 | #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */ | |
246 | #define NILFS_SUPER_MAGIC 0x3434 /* NILFS filesystem magic number */ | |
247 | ||
248 | #define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in | |
249 | a full segment */ | |
250 | #define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in | |
251 | a partial segment */ | |
252 | #define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved | |
253 | segments */ | |
254 | ||
255 | ||
256 | /* | |
257 | * Maximal count of links to a file | |
258 | */ | |
259 | #define NILFS_LINK_MAX 32000 | |
260 | ||
261 | /* | |
262 | * Structure of a directory entry | |
263 | * (Same as ext2) | |
264 | */ | |
265 | ||
266 | #define NILFS_NAME_LEN 255 | |
267 | ||
268 | /* | |
269 | * The new version of the directory entry. Since V0 structures are | |
270 | * stored in intel byte order, and the name_len field could never be | |
271 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
272 | * file_type field. | |
273 | */ | |
274 | struct nilfs_dir_entry { | |
275 | __le64 inode; /* Inode number */ | |
276 | __le16 rec_len; /* Directory entry length */ | |
277 | __u8 name_len; /* Name length */ | |
278 | __u8 file_type; | |
279 | char name[NILFS_NAME_LEN]; /* File name */ | |
280 | char pad; | |
281 | }; | |
282 | ||
283 | /* | |
284 | * NILFS directory file types. Only the low 3 bits are used. The | |
285 | * other bits are reserved for now. | |
286 | */ | |
287 | enum { | |
288 | NILFS_FT_UNKNOWN, | |
289 | NILFS_FT_REG_FILE, | |
290 | NILFS_FT_DIR, | |
291 | NILFS_FT_CHRDEV, | |
292 | NILFS_FT_BLKDEV, | |
293 | NILFS_FT_FIFO, | |
294 | NILFS_FT_SOCK, | |
295 | NILFS_FT_SYMLINK, | |
296 | NILFS_FT_MAX | |
297 | }; | |
298 | ||
299 | /* | |
300 | * NILFS_DIR_PAD defines the directory entries boundaries | |
301 | * | |
302 | * NOTE: It must be a multiple of 8 | |
303 | */ | |
304 | #define NILFS_DIR_PAD 8 | |
305 | #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) | |
306 | #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ | |
307 | ~NILFS_DIR_ROUND) | |
308 | ||
309 | ||
310 | /** | |
311 | * struct nilfs_finfo - file information | |
312 | * @fi_ino: inode number | |
313 | * @fi_cno: checkpoint number | |
314 | * @fi_nblocks: number of blocks (including intermediate blocks) | |
315 | * @fi_ndatablk: number of file data blocks | |
316 | */ | |
317 | struct nilfs_finfo { | |
318 | __le64 fi_ino; | |
319 | __le64 fi_cno; | |
320 | __le32 fi_nblocks; | |
321 | __le32 fi_ndatablk; | |
322 | /* array of virtual block numbers */ | |
323 | }; | |
324 | ||
325 | /** | |
326 | * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned | |
327 | * @bi_vblocknr: virtual block number | |
328 | * @bi_blkoff: block offset | |
329 | */ | |
330 | struct nilfs_binfo_v { | |
331 | __le64 bi_vblocknr; | |
332 | __le64 bi_blkoff; | |
333 | }; | |
334 | ||
335 | /** | |
336 | * struct nilfs_binfo_dat - information for the block which belongs to the DAT file | |
337 | * @bi_blkoff: block offset | |
338 | * @bi_level: level | |
339 | * @bi_pad: padding | |
340 | */ | |
341 | struct nilfs_binfo_dat { | |
342 | __le64 bi_blkoff; | |
343 | __u8 bi_level; | |
344 | __u8 bi_pad[7]; | |
345 | }; | |
346 | ||
347 | /** | |
348 | * union nilfs_binfo: block information | |
349 | * @bi_v: nilfs_binfo_v structure | |
350 | * @bi_dat: nilfs_binfo_dat structure | |
351 | */ | |
352 | union nilfs_binfo { | |
353 | struct nilfs_binfo_v bi_v; | |
354 | struct nilfs_binfo_dat bi_dat; | |
355 | }; | |
356 | ||
357 | /** | |
358 | * struct nilfs_segment_summary - segment summary | |
359 | * @ss_datasum: checksum of data | |
360 | * @ss_sumsum: checksum of segment summary | |
361 | * @ss_magic: magic number | |
362 | * @ss_bytes: size of this structure in bytes | |
363 | * @ss_flags: flags | |
364 | * @ss_seq: sequence number | |
365 | * @ss_create: creation timestamp | |
366 | * @ss_next: next segment | |
367 | * @ss_nblocks: number of blocks | |
368 | * @ss_nfinfo: number of finfo structures | |
369 | * @ss_sumbytes: total size of segment summary in bytes | |
370 | * @ss_pad: padding | |
371 | */ | |
372 | struct nilfs_segment_summary { | |
373 | __le32 ss_datasum; | |
374 | __le32 ss_sumsum; | |
375 | __le32 ss_magic; | |
376 | __le16 ss_bytes; | |
377 | __le16 ss_flags; | |
378 | __le64 ss_seq; | |
379 | __le64 ss_create; | |
380 | __le64 ss_next; | |
381 | __le32 ss_nblocks; | |
382 | __le32 ss_nfinfo; | |
383 | __le32 ss_sumbytes; | |
384 | __le32 ss_pad; | |
385 | /* array of finfo structures */ | |
386 | }; | |
387 | ||
388 | #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */ | |
389 | ||
390 | /* | |
391 | * Segment summary flags | |
392 | */ | |
393 | #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */ | |
394 | #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */ | |
395 | #define NILFS_SS_SR 0x0004 /* has super root */ | |
396 | #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */ | |
397 | #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */ | |
398 | ||
399 | /** | |
400 | * struct nilfs_palloc_group_desc - block group descriptor | |
401 | * @pg_nfrees: number of free entries in block group | |
402 | */ | |
403 | struct nilfs_palloc_group_desc { | |
404 | __le32 pg_nfrees; | |
405 | }; | |
406 | ||
407 | /** | |
408 | * struct nilfs_dat_entry - disk address translation entry | |
409 | * @dt_blocknr: block number | |
410 | * @dt_start: start checkpoint number | |
411 | * @dt_end: end checkpoint number | |
412 | * @dt_rsv: reserved for future use | |
413 | */ | |
414 | struct nilfs_dat_entry { | |
415 | __le64 de_blocknr; | |
416 | __le64 de_start; | |
417 | __le64 de_end; | |
418 | __le64 de_rsv; | |
419 | }; | |
420 | ||
421 | /** | |
422 | * struct nilfs_dat_group_desc - block group descriptor | |
423 | * @dg_nfrees: number of free virtual block numbers in block group | |
424 | */ | |
425 | struct nilfs_dat_group_desc { | |
426 | __le32 dg_nfrees; | |
427 | }; | |
428 | ||
429 | ||
430 | /** | |
431 | * struct nilfs_snapshot_list - snapshot list | |
432 | * @ssl_next: next checkpoint number on snapshot list | |
433 | * @ssl_prev: previous checkpoint number on snapshot list | |
434 | */ | |
435 | struct nilfs_snapshot_list { | |
436 | __le64 ssl_next; | |
437 | __le64 ssl_prev; | |
438 | }; | |
439 | ||
440 | /** | |
441 | * struct nilfs_checkpoint - checkpoint structure | |
442 | * @cp_flags: flags | |
443 | * @cp_checkpoints_count: checkpoints count in a block | |
444 | * @cp_snapshot_list: snapshot list | |
445 | * @cp_cno: checkpoint number | |
446 | * @cp_create: creation timestamp | |
447 | * @cp_nblk_inc: number of blocks incremented by this checkpoint | |
448 | * @cp_inodes_count: inodes count | |
449 | * @cp_blocks_count: blocks count | |
450 | * @cp_ifile_inode: inode of ifile | |
451 | */ | |
452 | struct nilfs_checkpoint { | |
453 | __le32 cp_flags; | |
454 | __le32 cp_checkpoints_count; | |
455 | struct nilfs_snapshot_list cp_snapshot_list; | |
456 | __le64 cp_cno; | |
457 | __le64 cp_create; | |
458 | __le64 cp_nblk_inc; | |
459 | __le64 cp_inodes_count; | |
460 | __le64 cp_blocks_count; /* Reserved (might be deleted) */ | |
461 | ||
462 | /* Do not change the byte offset of ifile inode. | |
463 | To keep the compatibility of the disk format, | |
464 | additional fields should be added behind cp_ifile_inode. */ | |
465 | struct nilfs_inode cp_ifile_inode; | |
466 | }; | |
467 | ||
468 | /* checkpoint flags */ | |
469 | enum { | |
470 | NILFS_CHECKPOINT_SNAPSHOT, | |
471 | NILFS_CHECKPOINT_INVALID, | |
472 | NILFS_CHECKPOINT_SKETCH, | |
473 | }; | |
474 | ||
475 | #define NILFS_CHECKPOINT_FNS(flag, name) \ | |
476 | static inline void \ | |
477 | nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \ | |
478 | { \ | |
479 | cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \ | |
480 | (1UL << NILFS_CHECKPOINT_##flag)); \ | |
481 | } \ | |
482 | static inline void \ | |
483 | nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \ | |
484 | { \ | |
485 | cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \ | |
486 | ~(1UL << NILFS_CHECKPOINT_##flag)); \ | |
487 | } \ | |
488 | static inline int \ | |
489 | nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \ | |
490 | { \ | |
491 | return !!(le32_to_cpu(cp->cp_flags) & \ | |
492 | (1UL << NILFS_CHECKPOINT_##flag)); \ | |
493 | } | |
494 | ||
495 | NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot) | |
496 | NILFS_CHECKPOINT_FNS(INVALID, invalid) | |
497 | NILFS_CHECKPOINT_FNS(SKETCH, sketch) | |
498 | ||
499 | /** | |
500 | * struct nilfs_cpinfo - checkpoint information | |
501 | * @ci_flags: flags | |
502 | * @ci_cno: checkpoint number | |
503 | * @ci_create: creation timestamp | |
504 | * @ci_nblk_inc: number of blocks incremented by this checkpoint | |
505 | * @ci_inodes_count: inodes count | |
506 | * @ci_blocks_count: blocks count | |
507 | * @ci_next: next checkpoint number in snapshot list | |
508 | */ | |
509 | struct nilfs_cpinfo { | |
510 | __u32 ci_flags; | |
511 | __u64 ci_cno; | |
512 | __u64 ci_create; | |
513 | __u64 ci_nblk_inc; | |
514 | __u64 ci_inodes_count; | |
515 | __u64 ci_blocks_count; | |
516 | __u64 ci_next; | |
517 | }; | |
518 | ||
519 | #define NILFS_CPINFO_FNS(flag, name) \ | |
520 | static inline int \ | |
521 | nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \ | |
522 | { \ | |
523 | return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \ | |
524 | } | |
525 | ||
526 | NILFS_CPINFO_FNS(SNAPSHOT, snapshot) | |
527 | NILFS_CPINFO_FNS(INVALID, invalid) | |
528 | NILFS_CPINFO_FNS(SKETCH, sketch) | |
529 | ||
530 | ||
531 | /** | |
532 | * struct nilfs_cpfile_header - checkpoint file header | |
533 | * @ch_ncheckpoints: number of checkpoints | |
534 | * @ch_nsnapshots: number of snapshots | |
535 | * @ch_snapshot_list: snapshot list | |
536 | */ | |
537 | struct nilfs_cpfile_header { | |
538 | __le64 ch_ncheckpoints; | |
539 | __le64 ch_nsnapshots; | |
540 | struct nilfs_snapshot_list ch_snapshot_list; | |
541 | }; | |
542 | ||
543 | #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ | |
544 | ((sizeof(struct nilfs_cpfile_header) + \ | |
545 | sizeof(struct nilfs_checkpoint) - 1) / \ | |
546 | sizeof(struct nilfs_checkpoint)) | |
547 | ||
548 | /** | |
549 | * struct nilfs_segment_usage - segment usage | |
550 | * @su_lastmod: last modified timestamp | |
551 | * @su_nblocks: number of blocks in segment | |
552 | * @su_flags: flags | |
553 | */ | |
554 | struct nilfs_segment_usage { | |
555 | __le64 su_lastmod; | |
556 | __le32 su_nblocks; | |
557 | __le32 su_flags; | |
558 | }; | |
559 | ||
560 | /* segment usage flag */ | |
561 | enum { | |
562 | NILFS_SEGMENT_USAGE_ACTIVE, | |
563 | NILFS_SEGMENT_USAGE_DIRTY, | |
564 | NILFS_SEGMENT_USAGE_ERROR, | |
565 | ||
566 | /* on-memory only */ | |
567 | NILFS_SEGMENT_USAGE_VOLATILE_ACTIVE, | |
568 | /* ... */ | |
569 | }; | |
570 | ||
571 | #define NILFS_SEGMENT_USAGE_FNS(flag, name) \ | |
572 | static inline void \ | |
573 | nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \ | |
574 | { \ | |
575 | su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \ | |
576 | (1UL << NILFS_SEGMENT_USAGE_##flag));\ | |
577 | } \ | |
578 | static inline void \ | |
579 | nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \ | |
580 | { \ | |
581 | su->su_flags = \ | |
582 | cpu_to_le32(le32_to_cpu(su->su_flags) & \ | |
583 | ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \ | |
584 | } \ | |
585 | static inline int \ | |
586 | nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \ | |
587 | { \ | |
588 | return !!(le32_to_cpu(su->su_flags) & \ | |
589 | (1UL << NILFS_SEGMENT_USAGE_##flag)); \ | |
590 | } | |
591 | ||
592 | NILFS_SEGMENT_USAGE_FNS(ACTIVE, active) | |
593 | NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty) | |
594 | NILFS_SEGMENT_USAGE_FNS(ERROR, error) | |
595 | NILFS_SEGMENT_USAGE_FNS(VOLATILE_ACTIVE, volatile_active) | |
596 | ||
597 | static inline void | |
598 | nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su) | |
599 | { | |
600 | su->su_lastmod = cpu_to_le64(0); | |
601 | su->su_nblocks = cpu_to_le32(0); | |
602 | su->su_flags = cpu_to_le32(0); | |
603 | } | |
604 | ||
605 | static inline int | |
606 | nilfs_segment_usage_clean(const struct nilfs_segment_usage *su) | |
607 | { | |
608 | return !le32_to_cpu(su->su_flags); | |
609 | } | |
610 | ||
611 | /** | |
612 | * struct nilfs_sufile_header - segment usage file header | |
613 | * @sh_ncleansegs: number of clean segments | |
614 | * @sh_ndirtysegs: number of dirty segments | |
615 | * @sh_last_alloc: last allocated segment number | |
616 | */ | |
617 | struct nilfs_sufile_header { | |
618 | __le64 sh_ncleansegs; | |
619 | __le64 sh_ndirtysegs; | |
620 | __le64 sh_last_alloc; | |
621 | /* ... */ | |
622 | }; | |
623 | ||
624 | #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ | |
625 | ((sizeof(struct nilfs_sufile_header) + \ | |
626 | sizeof(struct nilfs_segment_usage) - 1) / \ | |
627 | sizeof(struct nilfs_segment_usage)) | |
628 | ||
629 | /** | |
630 | * nilfs_suinfo - segment usage information | |
631 | * @sui_lastmod: | |
632 | * @sui_nblocks: | |
633 | * @sui_flags: | |
634 | */ | |
635 | struct nilfs_suinfo { | |
636 | __u64 sui_lastmod; | |
637 | __u32 sui_nblocks; | |
638 | __u32 sui_flags; | |
639 | }; | |
640 | ||
641 | #define NILFS_SUINFO_FNS(flag, name) \ | |
642 | static inline int \ | |
643 | nilfs_suinfo_##name(const struct nilfs_suinfo *si) \ | |
644 | { \ | |
645 | return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \ | |
646 | } | |
647 | ||
648 | NILFS_SUINFO_FNS(ACTIVE, active) | |
649 | NILFS_SUINFO_FNS(DIRTY, dirty) | |
650 | NILFS_SUINFO_FNS(ERROR, error) | |
651 | NILFS_SUINFO_FNS(VOLATILE_ACTIVE, volatile_active) | |
652 | ||
653 | static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si) | |
654 | { | |
655 | return !si->sui_flags; | |
656 | } | |
657 | ||
658 | /* ioctl */ | |
659 | enum { | |
660 | NILFS_CHECKPOINT, | |
661 | NILFS_SNAPSHOT, | |
662 | }; | |
663 | ||
664 | /** | |
665 | * struct nilfs_cpmode - | |
666 | * @cc_cno: | |
667 | * @cc_mode: | |
668 | */ | |
669 | struct nilfs_cpmode { | |
670 | __u64 cm_cno; | |
671 | int cm_mode; | |
672 | }; | |
673 | ||
674 | /** | |
675 | * struct nilfs_argv - argument vector | |
676 | * @v_base: | |
677 | * @v_nmembs: | |
678 | * @v_size: | |
679 | * @v_index: | |
680 | * @v_flags: | |
681 | */ | |
682 | struct nilfs_argv { | |
683 | void *v_base; | |
684 | size_t v_nmembs; /* number of members */ | |
685 | size_t v_size; /* size of members */ | |
686 | int v_index; | |
687 | int v_flags; | |
688 | }; | |
689 | ||
690 | /** | |
691 | * struct nilfs_period - | |
692 | * @p_start: | |
693 | * @p_end: | |
694 | */ | |
695 | struct nilfs_period { | |
696 | __u64 p_start; | |
697 | __u64 p_end; | |
698 | }; | |
699 | ||
700 | /** | |
701 | * struct nilfs_cpstat - | |
702 | * @cs_cno: checkpoint number | |
703 | * @cs_ncps: number of checkpoints | |
704 | * @cs_nsss: number of snapshots | |
705 | */ | |
706 | struct nilfs_cpstat { | |
707 | __u64 cs_cno; | |
708 | __u64 cs_ncps; | |
709 | __u64 cs_nsss; | |
710 | }; | |
711 | ||
712 | /** | |
713 | * struct nilfs_sustat - | |
714 | * @ss_nsegs: number of segments | |
715 | * @ss_ncleansegs: number of clean segments | |
716 | * @ss_ndirtysegs: number of dirty segments | |
717 | * @ss_ctime: | |
718 | * @ss_nongc_ctime: | |
719 | */ | |
720 | struct nilfs_sustat { | |
721 | __u64 ss_nsegs; | |
722 | __u64 ss_ncleansegs; | |
723 | __u64 ss_ndirtysegs; | |
724 | time_t ss_ctime; | |
725 | time_t ss_nongc_ctime; | |
726 | }; | |
727 | ||
728 | /** | |
729 | * struct nilfs_vinfo - virtual block number information | |
730 | * @vi_vblocknr: | |
731 | * @vi_start: | |
732 | * @vi_end: | |
733 | * @vi_blocknr: | |
734 | */ | |
735 | struct nilfs_vinfo { | |
736 | __u64 vi_vblocknr; | |
737 | __u64 vi_start; | |
738 | __u64 vi_end; | |
739 | __u64 vi_blocknr; | |
740 | }; | |
741 | ||
742 | /** | |
743 | * struct nilfs_vdesc - | |
744 | */ | |
745 | struct nilfs_vdesc { | |
746 | __u64 vd_ino; | |
747 | __u64 vd_cno; | |
748 | __u64 vd_vblocknr; | |
749 | struct nilfs_period vd_period; | |
750 | __u64 vd_blocknr; | |
751 | __u64 vd_offset; | |
752 | __u32 vd_flags; | |
753 | }; | |
754 | ||
755 | /** | |
756 | * struct nilfs_bdesc - | |
757 | */ | |
758 | struct nilfs_bdesc { | |
759 | __u64 bd_ino; | |
760 | __u64 bd_oblocknr; | |
761 | __u64 bd_blocknr; | |
762 | __u64 bd_offset; | |
763 | __u32 bd_level; | |
764 | }; | |
765 | ||
eed10e39 KS |
766 | #define NILFS_IOCTL_IDENT 'n' |
767 | ||
768 | #define NILFS_IOCTL_CHANGE_CPMODE \ | |
769 | _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode) | |
770 | #define NILFS_IOCTL_DELETE_CHECKPOINT \ | |
771 | _IOW(NILFS_IOCTL_IDENT, 0x81, __u64) | |
772 | #define NILFS_IOCTL_GET_CPINFO \ | |
773 | _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv) | |
774 | #define NILFS_IOCTL_GET_CPSTAT \ | |
775 | _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat) | |
776 | #define NILFS_IOCTL_GET_SUINFO \ | |
777 | _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv) | |
778 | #define NILFS_IOCTL_GET_SUSTAT \ | |
779 | _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat) | |
780 | #define NILFS_IOCTL_GET_VINFO \ | |
781 | _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv) | |
782 | #define NILFS_IOCTL_GET_BDESCS \ | |
783 | _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv) | |
784 | #define NILFS_IOCTL_CLEAN_SEGMENTS \ | |
785 | _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5]) | |
eed10e39 KS |
786 | #define NILFS_IOCTL_SYNC \ |
787 | _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64) | |
788 | #define NILFS_IOCTL_RESIZE \ | |
789 | _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64) | |
790 | ||
791 | /* compat_ioctl */ | |
792 | #ifdef CONFIG_COMPAT | |
793 | #include <linux/compat.h> | |
794 | ||
795 | struct nilfs_cpmode32 { | |
796 | __u64 cm_cno; | |
797 | compat_int_t cm_mode; | |
798 | }; | |
799 | ||
800 | struct nilfs_argv32 { | |
801 | compat_caddr_t v_base; | |
802 | compat_size_t v_nmembs; | |
803 | compat_size_t v_size; | |
804 | compat_int_t v_index; | |
805 | compat_int_t v_flags; | |
806 | }; | |
807 | ||
808 | struct nilfs_sustat32 { | |
809 | __u64 ss_nsegs; | |
810 | __u64 ss_ncleansegs; | |
811 | __u64 ss_ndirtysegs; | |
812 | compat_time_t ss_ctime; | |
813 | compat_time_t ss_nongc_ctime; | |
814 | }; | |
815 | ||
eed10e39 KS |
816 | #define NILFS_IOCTL32_CHANGE_CPMODE \ |
817 | _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode32) | |
818 | #define NILFS_IOCTL32_GET_CPINFO \ | |
819 | _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv32) | |
820 | #define NILFS_IOCTL32_GET_SUINFO \ | |
821 | _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv32) | |
822 | #define NILFS_IOCTL32_GET_SUSTAT \ | |
823 | _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat32) | |
824 | #define NILFS_IOCTL32_GET_VINFO \ | |
825 | _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv32) | |
826 | #define NILFS_IOCTL32_GET_BDESCS \ | |
827 | _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv32) | |
828 | #define NILFS_IOCTL32_CLEAN_SEGMENTS \ | |
829 | _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv32[5]) | |
eed10e39 KS |
830 | #endif /* CONFIG_COMPAT */ |
831 | ||
832 | #endif /* _LINUX_NILFS_FS_H */ |